The entities for the star engine from 248k Mod causes "invalid pipe connections specification" errors.
These additions to the blacklist fixed it for me:
-- 248k mod
if mods['248k'] then
appmod.blacklist['fu_star_engine_core_entity'] = true
appmod.blacklist['fu_star_engine_heater_entity'] = true
appmod.blacklist['fu_star_engine_heater_left_entity'] = true
appmod.blacklist['fu_star_engine_cooler_entity'] = true
appmod.blacklist['fu_star_engine_cooler_up_entity'] = true
end
